     (let [engine (Asciidoctor$Factory/create)
           _ (register-docinfo-processor! engine)
           ]
+      (assert fl)
       (.convertFile
        engine fl
        (..

    [["/manual/index.html"]
     (resource
      {:id ::manual
       :methods
       {:get
        {:produces {:media-type "text/html" :charset "UTF-8"}
         :response (asciidoc->html (io/file "doc" "yada-manual.adoc")
                                   {:toc true})}}})]

    [["/index.html"]
     (resource

                         (let [imgdir (io/file "doc")
                               fl (io/file imgdir (-> ctx :request :path-info))]
                           {:exists? (.exists fl)
                            :last-modified (.lastModified fl)
                            ::file fl}))
           :produces (fn [ctx] (ext-mime-type (.getName (-> ctx :properties ::file))))
           :methods
